1 files changed, 360 insertions, 0 deletions
diff --git a/vendor/gimli/src/read/endian_slice.rs b/vendor/gimli/src/read/endian_slice.rs
new file mode 100644
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+++ b/vendor/gimli/src/read/endian_slice.rs
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+//! Working with byte slices that have an associated endianity.
+
+#[cfg(feature = "read")]
+use alloc::borrow::Cow;
+#[cfg(feature = "read")]
+use alloc::string::String;
+use core::fmt;
+use core::ops::{Deref, Range, RangeFrom, RangeTo};
+use core::str;
+
+use crate::endianity::Endianity;
+use crate::read::{Error, Reader, ReaderOffsetId, Result};
+
+/// A `&[u8]` slice with endianity metadata.
+///
+/// This implements the `Reader` trait, which is used for all reading of DWARF sections.
+#[derive(Default, Clone, Copy, PartialEq, Eq, Hash)]
+pub struct EndianSlice<'input, Endian>
+where
+    Endian: Endianity,
+{
+    slice: &'input [u8],
+    endian: Endian,
+}
+
+impl<'input, Endian> EndianSlice<'input, Endian>
+where
+    Endian: Endianity,
+{
+    /// Construct a new `EndianSlice` with the given slice and endianity.
+    #[inline]
+    pub fn new(slice: &'input [u8], endian: Endian) -> EndianSlice<'input, Endian> {
+        EndianSlice { slice, endian }
+    }
+
+    /// Return a reference to the raw slice.
+    #[inline]
+    #[doc(hidden)]
+    #[deprecated(note = "Method renamed to EndianSlice::slice; use that instead.")]
+    pub fn buf(&self) -> &'input [u8] {
+        self.slice
+    }
+
+    /// Return a reference to the raw slice.
+    #[inline]
+    pub fn slice(&self) -> &'input [u8] {
+        self.slice
+    }
+
+    /// Split the slice in two at the given index, resulting in the tuple where
+    /// the first item has range [0, idx), and the second has range [idx,
+    /// len). Panics if the index is out of bounds.
+    #[inline]
+    pub fn split_at(
+        &self,
+        idx: usize,
+    ) -> (EndianSlice<'input, Endian>, EndianSlice<'input, Endian>) {
+        (self.range_to(..idx), self.range_from(idx..))
+    }
+
+    /// Find the first occurrence of a byte in the slice, and return its index.
+    #[inline]
+    pub fn find(&self, byte: u8) -> Option<usize> {
+        self.slice.iter().position(|ch| *ch == byte)
+    }
+
+    /// Return the offset of the start of the slice relative to the start
+    /// of the given slice.
+    #[inline]
+    pub fn offset_from(&self, base: EndianSlice<'input, Endian>) -> usize {
+        let base_ptr = base.slice.as_ptr() as *const u8 as usize;
+        let ptr = self.slice.as_ptr() as *const u8 as usize;
+        debug_assert!(base_ptr <= ptr);
+        debug_assert!(ptr + self.slice.len() <= base_ptr + base.slice.len());
+        ptr - base_ptr
+    }
+
+    /// Converts the slice to a string using `str::from_utf8`.
+    ///
+    /// Returns an error if the slice contains invalid characters.
+    #[inline]
+    pub fn to_string(&self) -> Result<&'input str> {
+        str::from_utf8(self.slice).map_err(|_| Error::BadUtf8)
+    }
+
+    /// Converts the slice to a string, including invalid characters,
+    /// using `String::from_utf8_lossy`.
+    #[cfg(feature = "read")]
+    #[inline]
+    pub fn to_string_lossy(&self) -> Cow<'input, str> {
+        String::from_utf8_lossy(self.slice)
+    }
+
+    #[inline]
+    fn read_slice(&mut self, len: usize) -> Result<&'input [u8]> {
+        if self.slice.len() < len {
+            Err(Error::UnexpectedEof(self.offset_id()))
+        } else {
+            let val = &self.slice[..len];
+            self.slice = &self.slice[len..];
+            Ok(val)
+        }
+    }
+}
+
+/// # Range Methods
+///
+/// Unfortunately, `std::ops::Index` *must* return a reference, so we can't
+/// implement `Index<Range<usize>>` to return a new `EndianSlice` the way we would
+/// like to. Instead, we abandon fancy indexing operators and have these plain
+/// old methods.
+impl<'input, Endian> EndianSlice<'input, Endian>
+where
+    Endian: Endianity,
+{
+    /// Take the given `start..end` range of the underlying slice and return a
+    /// new `EndianSlice`.
+    ///
+    /// ```
+    /// use gimli::{EndianSlice, LittleEndian};
+    ///
+    /// let slice = &[0x01, 0x02, 0x03, 0x04];
+    /// let endian_slice = EndianSlice::new(slice, LittleEndian);
+    /// assert_eq!(endian_slice.range(1..3),
+    ///            EndianSlice::new(&slice[1..3], LittleEndian));
+    /// ```
+    pub fn range(&self, idx: Range<usize>) -> EndianSlice<'input, Endian> {
+        EndianSlice {
+            slice: &self.slice[idx],
+            endian: self.endian,
+        }
+    }
+
+    /// Take the given `start..` range of the underlying slice and return a new
+    /// `EndianSlice`.
+    ///
+    /// ```
+    /// use gimli::{EndianSlice, LittleEndian};
+    ///
+    /// let slice = &[0x01, 0x02, 0x03, 0x04];
+    /// let endian_slice = EndianSlice::new(slice, LittleEndian);
+    /// assert_eq!(endian_slice.range_from(2..),
+    ///            EndianSlice::new(&slice[2..], LittleEndian));
+    /// ```
+    pub fn range_from(&self, idx: RangeFrom<usize>) -> EndianSlice<'input, Endian> {
+        EndianSlice {
+            slice: &self.slice[idx],
+            endian: self.endian,
+        }
+    }
+
+    /// Take the given `..end` range of the underlying slice and return a new
+    /// `EndianSlice`.
+    ///
+    /// ```
+    /// use gimli::{EndianSlice, LittleEndian};
+    ///
+    /// let slice = &[0x01, 0x02, 0x03, 0x04];
+    /// let endian_slice = EndianSlice::new(slice, LittleEndian);
+    /// assert_eq!(endian_slice.range_to(..3),
+    ///            EndianSlice::new(&slice[..3], LittleEndian));
+    /// ```
+    pub fn range_to(&self, idx: RangeTo<usize>) -> EndianSlice<'input, Endian> {
+        EndianSlice {
+            slice: &self.slice[idx],
+            endian: self.endian,
+        }
+    }
+}
+
+impl<'input, Endian> Deref for EndianSlice<'input, Endian>
+where
+    Endian: Endianity,
+{
+    type Target = [u8];
+    fn deref(&self) -> &Self::Target {
+        self.slice
+    }
+}
+
+impl<'input, Endian: Endianity> fmt::Debug for EndianSlice<'input, Endian> {
+    fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> core::result::Result<(), fmt::Error> {
+        fmt.debug_tuple("EndianSlice")
+            .field(&self.endian)
+            .field(&DebugBytes(self.slice))
+            .finish()
+    }
+}
+
+struct DebugBytes<'input>(&'input [u8]);
+
+impl<'input> core::fmt::Debug for DebugBytes<'input> {
+    fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> core::result::Result<(), fmt::Error> {
+        let mut list = fmt.debug_list();
+        list.entries(self.0.iter().take(8).copied().map(DebugByte));
+        if self.0.len() > 8 {
+            list.entry(&DebugLen(self.0.len()));
+        }
+        list.finish()
+    }
+}
+
+struct DebugByte(u8);
+
+impl fmt::Debug for DebugByte {
+    fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result {
+        write!(fmt, "0x{:02x}", self.0)
+    }
+}
+
+struct DebugLen(usize);
+
+impl fmt::Debug for DebugLen {
+    fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result {
+        write!(fmt, "...; {}", self.0)
+    }
+}
+
+impl<'input, Endian> Reader for EndianSlice<'input, Endian>
+where
+    Endian: Endianity,
+{
+    type Endian = Endian;
+    type Offset = usize;
+
+    #[inline]
+    fn endian(&self) -> Endian {
+        self.endian
+    }
+
+    #[inline]
+    fn len(&self) -> usize {
+        self.slice.len()
+    }
+
+    #[inline]
+    fn is_empty(&self) -> bool {
+        self.slice.is_empty()
+    }
+
+    #[inline]
+    fn empty(&mut self) {
+        self.slice = &[];
+    }
+
+    #[inline]
+    fn truncate(&mut self, len: usize) -> Result<()> {
+        if self.slice.len() < len {
+            Err(Error::UnexpectedEof(self.offset_id()))
+        } else {
+            self.slice = &self.slice[..len];
+            Ok(())
+        }
+    }
+
+    #[inline]
+    fn offset_from(&self, base: &Self) -> usize {
+        self.offset_from(*base)
+    }
+
+    #[inline]
+    fn offset_id(&self) -> ReaderOffsetId {
+        ReaderOffsetId(self.slice.as_ptr() as u64)
+    }
+
+    #[inline]
+    fn lookup_offset_id(&self, id: ReaderOffsetId) -> Option<Self::Offset> {
+        let id = id.0;
+        let self_id = self.slice.as_ptr() as u64;
+        let self_len = self.slice.len() as u64;
+        if id >= self_id && id <= self_id + self_len {
+            Some((id - self_id) as usize)
+        } else {
+            None
+        }
+    }
+
+    #[inline]
+    fn find(&self, byte: u8) -> Result<usize> {
+        self.find(byte)
+            .ok_or_else(|| Error::UnexpectedEof(self.offset_id()))
+    }
+
+    #[inline]
+    fn skip(&mut self, len: usize) -> Result<()> {
+        if self.slice.len() < len {
+            Err(Error::UnexpectedEof(self.offset_id()))
+        } else {
+            self.slice = &self.slice[len..];
+            Ok(())
+        }
+    }
+
+    #[inline]
+    fn split(&mut self, len: usize) -> Result<Self> {
+        let slice = self.read_slice(len)?;
+        Ok(EndianSlice::new(slice, self.endian))
+    }
+
+    #[cfg(not(feature = "read"))]
+    fn cannot_implement() -> super::reader::seal_if_no_alloc::Sealed {
+        super::reader::seal_if_no_alloc::Sealed
+    }
+
+    #[cfg(feature = "read")]
+    #[inline]
+    fn to_slice(&self) -> Result<Cow<[u8]>> {
+        Ok(self.slice.into())
+    }
+
+    #[cfg(feature = "read")]
+    #[inline]
+    fn to_string(&self) -> Result<Cow<str>> {
+        match str::from_utf8(self.slice) {
+            Ok(s) => Ok(s.into()),
+            _ => Err(Error::BadUtf8),
+        }
+    }
+
+    #[cfg(feature = "read")]
+    #[inline]
+    fn to_string_lossy(&self) -> Result<Cow<str>> {
+        Ok(String::from_utf8_lossy(self.slice))
+    }
+
+    #[inline]
+    fn read_slice(&mut self, buf: &mut [u8]) -> Result<()> {
+        let slice = self.read_slice(buf.len())?;
+        buf.copy_from_slice(slice);
+        Ok(())
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use crate::endianity::NativeEndian;
+
+    #[test]
+    fn test_endian_slice_split_at() {
+        let endian = NativeEndian;
+        let slice = &[1, 2, 3, 4, 5, 6, 7, 8, 9, 0];
+        let eb = EndianSlice::new(slice, endian);
+        assert_eq!(
+            eb.split_at(3),
+            (
+                EndianSlice::new(&slice[..3], endian),
+                EndianSlice::new(&slice[3..], endian)
+            )
+        );
+    }
+
+    #[test]
+    #[should_panic]
+    fn test_endian_slice_split_at_out_of_bounds() {
+        let slice = &[1, 2, 3, 4, 5, 6, 7, 8, 9, 0];
+        let eb = EndianSlice::new(slice, NativeEndian);
+        eb.split_at(30);
+    }
+}